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What's the main device to hammer in a nail?
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A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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This is a science community. We use the Dawkins definition of meme.
There is simply no solution. If you choose an answer as “correct” it is shown to be not correct, (not a 25% chance to choose 25%, not a 50% chance to choose 50%, not a 0% chance to choose 0%) showing there is no correct answer.
There's always a solution. Even if it's "empty set".
Sure same thing.